Much to the couple’s comfort their income is now double it was five years ago. A. thatB.

问题补充：

Much to the couple’s comfort, their income is now double it was five years ago.

A. that

B. than

C. which

D. what

答案：

A. that

B. than

C. which

(答案→)D. what

解析：考查名词性从句。What在从句中作表语，句意：使这对夫妇安慰的是，他们的收入是五年前的两倍。